JPH0517392Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is generally used in large vehicles such as trucks or buses, where the exhaust gas is discharged through an exhaust flow path that is connected to the middle of the exhaust pipe, and which flows through the exhaust pipe during steep downhill slopes. The present invention relates to an improvement in the structure of an auxiliary valve mechanism in a slide type exhaust brake device that provides a braking effect to a vehicle by closing the auxiliary valve mechanism.

(Prior Art) Conventionally, as a structure of an auxiliary valve mechanism in this type of exhaust brake device, the present applicant has proposed
The invention proposed in this publication and described in this publication will be explained with reference to FIGS. 8 to 10 as examples. A support frame 18 having a substantially C-shaped cross section is attached to the other side of the block member 20 which is fixed so as to engage with the valve member 15 on one side.
A supporting frame is provided with upstanding walls at both ends in the longitudinal direction perpendicular to the direction of movement of the piston rod, which slides on the bottom wall surface of the valve member 15 that is loosely installed inside the frame. It was formed by a liner 19 sunk in. Note that reference numeral 14 is an exhaust pressure adjustment hole provided through the valve member 15.

(Problems to be solved by the invention) In general, the above-mentioned slide type exhaust brake device is
When the opening/closing path is activated, the torsional moment in the coil spring generated by the expansion and contraction of the coil spring, which is installed inside the air cylinder device and always urges the piston upward, causes the piston and piston rod to move left and right. It tends to induce vibration due to repetition.

However, the conventional auxiliary valve member 17 has a liner 19 that is loosely installed inside the support frame 18 and is recessed, so that the liner 19 integrally follows the rocking movement and moves to the support frame 18. A similar rocking occurs, and the peripheral edge of one or both ends of the frame in the long direction perpendicular to the moving direction of the piston rod touches the sliding surface on the valve member 15 side and the exhaust brake body as shown in FIG. There is a possibility that the inner surface of the housing rubs against each other, causing local wear or damage to each other and causing malfunctions.

In order to effectively solve the above-mentioned conventional problems, the present invention protrudes at least a part of the peripheral edge of the liner on the side of the auxiliary valve member in parallel with the bottom wall surface of the valve member to form a tongue-like portion, and the protruding tongue By constructing the structure in which the shaped portion is laid between the peripheral wall of the support frame and the bottom wall surface of the valve member, even when the support frame swings to follow the swing, the support frame remains stable. The vibration is suppressed by contact with the tongue-like portion of the peripheral edge of the liner, which prevents the sliding surface of the support frame on the valve member side and the inner surface of the housing from rubbing against each other, thereby preventing its operation. The object of the present invention is to propose a sliding type exhaust brake device that is smooth and reliable, eliminates the fear of mutual local wear or damage, and can be used for a long period of time.

(Means for Solving the Problem) The present invention is based on an exhaust brake main body in which a reciprocating operating path of a plate-shaped valve member is communicated with a reciprocating operating path of a plate-shaped valve member in a direction approximately perpendicular to an exhaust flow path in which connection walls with an exhaust pipe are protruded from both ends of the exhaust brake body. The valve member having the exhaust pressure adjustment hole penetrated therein is housed inside the housing, and the piston is installed near the tip of the piston rod that passes through the partition wall between the air cylinder device and the air cylinder device connected to one end of the reciprocating working path. An auxiliary valve member is attached to the other side of the block member, which is fixed so as to engage with the valve member attached to the tip end side of the rod, and when the valve member closes the exhaust flow path, the auxiliary valve member allows the exhaust to be discharged. While closing the pressure adjustment hole, the valve member is pushed to one side by the tip of the piston rod, and when opening the exhaust pressure adjustment hole is opened by the auxiliary valve member, and the block member engages with the valve member and moves to the other side. In the exhaust brake device, the auxiliary valve member is connected to a support frame having a substantially C-shaped cross section and connected to the vicinity of the tip of the piston rod, and the piston rod by sliding the auxiliary valve member on the bottom wall surface of the valve member. a liner provided with upstanding walls at both longitudinal ends perpendicular to the movement direction of the valve member, and a liner loosely fitted inside the support frame, and at least a part of the periphery of the liner is formed at the bottom of the valve member. The gist of the slide type exhaust brake device is to provide a sliding exhaust brake device in which a tongue-shaped portion is formed by protruding parallel to a wall surface, and the tongue-shaped portion is installed between the peripheral wall portion of the support frame and the bottom wall surface of the valve member. It is something to do.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on the drawings. Fig. 1 is a partially cutaway plan view of the sliding exhaust brake device of the present invention, and Fig. 2 is a partially cutaway plan view of the sliding exhaust brake device of the present invention.
Fig. 3 is an enlarged cross-sectional view with a partial cutout of the valve member portion according to the main part of the present invention taken along the line A-A; The figure shown in FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3,
5 to 7 show other embodiments of the present invention, and are central longitudinal sectional views of the liner portion.
1 is a housing of an exhaust brake main body in which a reciprocating operating path of a plate-shaped valve member 3 is communicated in a direction substantially perpendicular to an exhaust flow path 2 which has connecting walls 1' with an exhaust pipe protruding from both ends; The valve member 3 with the exhaust pressure adjustment hole 4 penetrating the reciprocating working path is installed inside the reciprocating working path, and the valve member 3 has a piston passing through a partition wall between the air cylinder device 5 and the air cylinder device 5 connected to the upper end of the reciprocating working path. It is configured to be attached to the vicinity of the tip of the rod 6.

7 has a substantially C-shaped cross section and is attached to the other surface side of a block member 10 which is fixed to the distal side of the engaging portion of the valve member 3 so as to engage with the engaging wall portion of the valve member on one side thereof. Upright walls 12 are provided at both ends of the support frame 8 and the bottom wall on the side of the valve member 3 in the longitudinal direction perpendicular to the moving direction of the piston rod 6, and are loosely attached inside the support frame. This is an auxiliary valve member formed by the inner liner 9. As shown in FIGS. 3 and 4, the liner 9 has a rear peripheral edge projected in parallel with the bottom wall surface of the valve member 3 to form a tongue-shaped portion 9', and the tongue-shaped portion is connected to the support frame. 8 and the bottom wall surface of the valve member 3. Note that, as shown in FIGS. 5 and 6, the plate material may be folded back to form tongue-like portions 9' on both ends of the liner 9 in the longitudinal direction perpendicular to the moving direction of the piston rod 6. As shown in FIG. 7, the liner 9 may be formed of a cast metal, and the tongue-like portions 9' may be formed on the circumferential edges of both ends in the longitudinal direction as in FIGS. 5 and 6. In this case, the tongue 9' is laid between the pair of lateral peripheral walls of the support frame 8 and the bottom wall surface of the valve member 3. Reference numeral 11 denotes a coil spring that is installed inside the air cylinder device 5 and always urges a piston (not shown) upward.

(Function) Since the present invention is configured as described above, when the support frame 8 swings about the axis of the piston rod 6 during the opening/closing operation of the exhaust flow passage 2, the peripheral wall of the support frame 8 By protruding at least a part of the peripheral edge of the liner 9 laid between the liner 9 and the bottom wall surface of the valve member 3 in parallel with the bottom wall surface of the valve member 3 to form a tongue-shaped portion 9', the tongue-shaped portion 9' is formed. When the portion 9' and the support frame come into contact with each other, the lower end surface of the support frame 8 on one side in the longitudinal direction floats above the sliding surface on the valve member 3 side, and the other side floats above the inner surface of the housing 1. At the very least, rubbing against each other can be prevented.

(Effects of the invention) As explained above, the sliding exhaust brake device according to the invention particularly includes at least a portion of the peripheral edge of the liner 9 protruding parallel to the bottom wall surface of the valve member 3 to form the tongue-shaped portion 9'. , this tongue-like part is supported by the support frame 8
Since it is constructed by being installed between the peripheral wall of the valve member 3 and the bottom wall surface of the valve member 3, the torsional moment generated due to the expansion and contraction movement of the coil spring 11 when opening and closing the exhaust flow passage 2 causes the piston and the piston rod 6 to move to the left and right. Even when the support frame 8 swings to follow the swing of the piston rod 6, the sliding surface on the valve member 3 side by the peripheral edge of one or both ends in the longitudinal direction perpendicular to the moving direction of the piston rod 6 and the inner surface of the housing 1. An extremely useful slide that can prevent friction between the slides and operate smoothly and reliably, eliminates concerns about mutual local wear or damage, extends product life, and can be used for a long time. It is a type exhaust brake device.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of a sliding exhaust brake device showing one embodiment of the present invention;
The figure is an enlarged cross-sectional view with a partial cutout of the valve member part related to the main part of the present invention taken along the line A-A in Figure 1,
FIG. 4 is a sectional view taken along line B-B in FIG. 3, and FIGS. 5 to 7 are other embodiments of the present invention. Examples are shown in the center longitudinal cross-sectional view of the liner section, No. 8
9 is a plan view of the liner shown in FIG. 8 in its recessed state in the support frame; FIG.
The figure is a diagram corresponding to FIG. 5 of the conventional example of FIG. 8. 3... Valve member, 6... Piston rod, 7... Auxiliary valve member, 8... Support frame, 9... Liner, 9'
... tongue, 12 ... erected wall.

Claims (1)

[Scope of utility model registration request] An exhaust pressure adjustment hole is provided in the housing of the exhaust brake body, which communicates the reciprocating operating path of the plate-shaped valve member in a direction approximately perpendicular to the exhaust flow path, which has connecting walls with the exhaust pipe protruding from both ends. The valve member is attached to the front end of the piston rod near the front end of the piston rod, the valve member being installed inside the piston rod and penetrating the partition wall between the air cylinder device and the air cylinder device connected to one end of the reciprocating working path. An auxiliary valve member is attached to the other side of the block member that is fixed to engage with one side of the block member, and when the valve member closes the exhaust flow path, the auxiliary valve member closes the exhaust pressure adjustment hole and the valve is closed at the tip of the piston rod. In an exhaust brake device in which a member is pressed to one side, the auxiliary valve member opens the exhaust pressure adjustment hole when the circuit is opened, and the block member engages with the valve member and moves to the other side, wherein the auxiliary valve member 7 of,
A support frame 8 having a substantially C-shaped cross section and connected to the vicinity of the tip of the piston rod 6, and a support frame 8 that is slidably disposed on the bottom wall surface on the side of the valve member 3 in a longitudinal direction perpendicular to the direction of movement of the piston rod. and a liner 9 provided with upright walls 12 at both ends and loosely installed inside the support frame, with at least a part of the periphery of the liner 9 protruding parallel to the bottom wall surface of the valve member. A slide type exhaust system characterized in that a tongue-like part 9' is formed by extending the tongue-like part 9' between the peripheral wall of the support frame 8 and the bottom wall surface of the valve member 3. Brake device.